Looking to take a harder line after North Korea's recent nuclear test and rocket launch, Seoul and Washington will begin talks as early as next week on deploying a sophisticated US missile defense system in South Korea, officials said Friday.

The new tough stance follows South Korea's decision to shut down an inter-Korean factory park that had been the rival Koreas' last major symbol of cooperation, but that Seoul said had been used by North Korea to fund its nuclear and missile programs. North Korea responded by deporting South Korean citizens, seizing South Korean assets and vowing to militarize the park.

South Korea on Friday cut off power and water supplies to the industrial park and announced that its planned talks with the United States on deploying the Terminal High-Altitude Area Defense, or THAAD, one of the most advanced missile defense systems in the world, could start next week. Officials say they have yet to set a specific starting date for the talks.

South Korean media have long speculated that the two countries are working on a THAAD deployment in South Korea, but it took the North's rocket launch, which outsiders see as a test of banned ballistic missile technology, for the allies to formally announce they will begin the missile defense talks.

Beijing and Moscow are sensitive to the possibility of THAAD in South Korea; critics say the system could help US radar spot missiles in other countries.

China's state media quickly made the country's displeasure known, while Russia also expressed worries about the deployment. North Korea has previously warned of a nuclear war in the region and threatened to bolster its armed forces if the THAAD deployment occurs.

In Munich, US Secretary of State John Kerry was meeting with his Chinese and South Korean counterparts to discuss the response to North Korea's actions, including the missile system.

"That's what we're talking about today," Kerry told reporters as he started talks with Chinese Foreign Minister Wang Yi on the sidelines of a Munich Security Conference.

Kerry was to meet with South Korean Foreign Minister Yun Byung-se immediately after seeing Wang.

Seoul and Washington want to deploy the system at an early date and the upcoming talks will discuss where and exactly when the deployment can be made, a South Korean defense official said, requesting anonymity because of department rules.

The official said the THAAD deployment is designed to protect South Korea from North Korean threats and isn't targeting China or anyone else.

The current standoff flared after North Korea carried out a nuclear test last month, its fourth, followed by the long-range rocket launch on Sunday.

In one of its harshest possible options for punishment, South Korea on Thursday began suspending operations at the factory park in the North Korean border town of Kaesong.

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